Law of Conservation of Mass

Flashcard
•
Science
•
7th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the Law of Conservation of Mass?
Back
Mass is never created or destroyed in a chemical reaction.
2.
FLASHCARD QUESTION
Front
What is a subscript in a chemical formula?
Back
A subscript is a number written below and to the right of an element symbol that indicates the number of atoms of that element in a molecule.
3.
FLASHCARD QUESTION
Front
In the reaction A + B --> C, if A has 5g and C has 9g, how many grams does B have?
Back
4g
4.
FLASHCARD QUESTION
Front
How many sulfur atoms are in the reactants of the equation: 2SO2 + 2H2O2 --> 2H2SO4?
Back
2
5.
FLASHCARD QUESTION
Front
What happens to the mass of reactants in a chemical reaction?
Back
The total mass of the reactants equals the total mass of the products.
6.
FLASHCARD QUESTION
Front
What is a coefficient in a chemical equation?
Back
A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved.
7.
FLASHCARD QUESTION
Front
When CaCO3 is heated, what happens to its mass?
Back
The sum of the products’ masses equals the mass of the CaCO3.
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